Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory
Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory
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DOI：
10.1103/physrevd.108.112006
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发表时间：
2023-01
影响因子：
5
通讯作者：
L. Balogh;C. Beaufort;M. Chapellier;E. C. Corcoran;J.-M. Coquillat;A. Dastgheibi-Fard;Y. Deng;D. Durnford;C. Garrah;G. Gerbier;I. Giomataris;G. Giroux;P. Gorel;M. Gros;P. Gros;O. Guillaudin;E. Hoppe;I. Katsioulas;F. Kelly;P. Knights;P. Lautridou;I. Manthos;R. D. Martin;J. Matthews;J. Muraz;T. Neep;K. Nikolopoulos;P. O'Brien;M. Piro;N. Rowe;D. Santos;G. Savvidis;I. Savvidis;F. Vazquez de Sola Fernandez;R. Ward;E. Banks;L. Hamaide;C. McCabe;K. Mimasu;S. Paling
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文献类型：
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作者：
L. Balogh;C. Beaufort;M. Chapellier;E. C. Corcoran;J.-M. Coquillat;A. Dastgheibi-Fard;Y. Deng;D. Durnford;C. Garrah;G. Gerbier;I. Giomataris;G. Giroux;P. Gorel;M. Gros;P. Gros;O. Guillaudin;E. Hoppe;I. Katsioulas;F. Kelly;P. Knights;P. Lautridou;I. Manthos;R. D. Martin;J. Matthews;J. Muraz;T. Neep;K. Nikolopoulos;P. O'Brien;M. Piro;N. Rowe;D. Santos;G. Savvidis;I. Savvidis;F. Vazquez de Sola Fernandez;R. Ward;E. Banks;L. Hamaide;C. McCabe;K. Mimasu;S. Paling
我们介绍了暗球的概念设计和物理潜力，这是一种建议在博尔比地下实验室地下电铸的直径为3m的球形正比计数器。这一努力建立在NEWS-G合作所进行的研发和获得的经验基础上。DarkSPHERE的主要目的是寻找0.05-10GeV质量范围内的暗物质产生的核反冲。电铸球形外壳和基于纯水的屏蔽层的实施确保了背景水平低于0.01dru。与所提出的氦-异丁烷混合气体相结合，对于暗物质质量为0.1(1)$GeV的核子截面，将提供与自旋无关的2×10^-41(2×10^-43})$cm$^2的灵敏度。使用自然丰度为C的富氢混合气体提供了对自旋相关核子截面的灵敏度，比现有的暗物质轻于1GeV的约束低两个数量级以上。探测器的特性也使其适合于搜索其他暗物质特征，包括MeV级暗物质与电子的散射，以及质量在普朗克尺度附近的超重暗物质，这些物质在探测器中留下了延长的电离轨迹。
We present the conceptual design and the physics potential of DarkSPHERE, a proposed 3 m in diameter spherical proportional counter electroformed underground at the Boulby Underground Laboratory. This effort builds on the R&D performed and experience acquired by the NEWS-G Collaboration. DarkSPHERE is primarily designed to search for nuclear recoils from light dark matter in the 0.05--10 GeV mass range. Electroforming the spherical shell and the implementation of a shield based on pure water ensures a background level below 0.01 dru. These, combined with the proposed helium-isobutane gas mixture, will provide sensitivity to the spin-independent nucleon cross-section of $2\times 10^{-41} (2\times 10^{-43})$ cm$^2$ for a dark matter mass of $0.1 (1)$ GeV. The use of a hydrogen-rich gas mixture with a natural abundance of $^{13}$C provides sensitivity to spin-dependent nucleon cross-sections more than two orders of magnitude below existing constraints for dark matter lighter than 1 GeV. The characteristics of the detector also make it suitable for searches of other dark matter signatures, including scattering of MeV-scale dark matter with electrons, and super-heavy dark matter with masses around the Planck scale that leave extended ionisation tracks in the detector.